Opposition of the thumb.
D006225:Hand / Q000502:physiology* / Q000601:surgery; D006801:Humans; D008475:Median Nerve / Q000502:physiology; D009132:Muscles / Q000033:anatomy & histology; D009135:Muscular Diseases / Q000175:diagnosis / Q000601:surgery; D010243:Paralysis / Q000209:etiology; D011826:Radial Nerve / Q000502:physiology; D013933:Thumb / Q000033:anatomy & histology / Q000502:physiology* / Q000601:surgery; D014459:Ulnar Nerve / Q000502:physiology